PCX is mostly used in IBM PC-compatible systems. The most popular format version is 5th, VGA palette is supported in 3rd and later versions that do not support individually created palettes. The maximum size is 64k x 64k pixels. PCS supports RGB mode, indexed raster colors, grayscale colors, as well as alpha-channels. The depth of image in PCX can be 1, 4, 8 or 24 bit. Complex compression scheme actually can increase the file size and is not suitable for deep-pixel graphics.

PNG images provide lossless compression, that is why the quality of the picture is nice, but the size of the file is huge. Because of it this file format is used by photographers. PNG may have several layers of transparency and even include short text descriptions which help search engines to examine the file. Although PNG was developed to replace GIF and partly other formats, it doesn’t support animation since it can’t contain several images like GIF.